docs: def cli(env, sortby, columns, datacenter, username, storage_type):
      """List file storage."""
      file_manager = SoftLayer.FileStorageManager(env.client)
      file_volumes = file_manager.list_file_volumes(datacenter=datacenter,
                                                    username=username,
                                                    storage_type=storage_type,
                                                    mask=columns.mask())
  
      table = formatting.Table(columns.columns)
      table.sortby = sortby
  
      for file_volume in file_volumes:
          table.add_row([value or formatting.blank()
                         for value in columns.row(file_volume)])
  
      env.fout(table)